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2004 Outback w/EJ251 2.5L SOHC w/ air injector injection,

Customer Question
113K miles. Keep getting P0303...
2004 Outback w/EJ251 2.5L SOHC w/ air injector injection, 113K miles. Keep getting P0303 cylinder #3 misfire only during initial cold start up for 5-15 seconds. Once misfire clears, engine runs fine. New #3 spark plug, new #3 ignition wire, new coil pack, swapped #1 & #3 injectors & problem did not go with injector swap, compression 185 psi both #1 & #3 cylinders cold, checked valve clearance to Subaru service manual spec-ok, cleaned air injector injection system, cleaned throttle body, new MAP sensor & IAC. Head gaskets & front & rear O2 sensors recently replaced. What is the root cause of #3 misfire?
Submitted: 2 years ago.Category: Subaru
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Answered in 9 minutes by:
2/19/2016
Subaru Mechanic: George H., Subaru Certified Technician replied 2 years ago
George H.
George H., Subaru Certified Technician
Category: Subaru
Satisfied Customers: 19,349
Experience: ASE Master Tech 15 + Years
Verified

Hello I will help you with your question,

Any coolant usage at all?

Have you pulled the #3 plug cold and looked inside the cylinder?

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Customer reply replied 2 years ago
3 plug looks fine, just like #1. No signs of coolant.
Subaru Mechanic: George H., Subaru Certified Technician replied 2 years ago

Ok, then how long since the timing belt has been replaced?

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Customer reply replied 2 years ago
Timing belt was replaced @ 75K miles.
Subaru Mechanic: George H., Subaru Certified Technician replied 2 years ago

How many miles now and why was the belt replaced so early?

I am unable to speak on the phone.

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Customer reply replied 2 years ago
Purchased car for daughter going into Navy & replaced as reqular maintenance. She bought new car and it was returned.
Subaru Mechanic: George H., Subaru Certified Technician replied 2 years ago

I don't understand, how many miles are on it now and it was returned to you?

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Customer reply replied 2 years ago
113,800 miles.
Subaru Mechanic: George H., Subaru Certified Technician replied 2 years ago

Ok, I don't think I am going to be able to help you from here. I would need to be hands on so I will OPT OUT

Sorry I could not help

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Subaru Mechanic: tamaz,
 replied 2 years ago
tamaz
Category: Subaru
Satisfied Customers: 3,016
Verified
Phone call session started
Subaru Mechanic: Chris(aka-Moose), Subaru Technician replied 2 years ago
Chris(aka-Moose)
Chris(aka-Moose), Subaru Technician
Category: Subaru
Satisfied Customers: 53,315
Experience: 16 years of experience
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Welcome, I'm Chris (aka Moose). Experts aren't employees / agents of Just Answer. We are independent service providers using the Site to sell their Expert knowledge to Customers. I strive to provide EXCELLENT 5 STAR service, let me know what's needed from me so your pleased.

The prior tech has opted out, would you like me to try and help?

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Subaru Mechanic: Chris(aka-Moose), Subaru Technician replied 2 years ago

I like to stay in contact with my customers. I assume you were not pleased with me or my answer since you did not rate it leaving me feedback. Just so you know we can still work on this issue. We can pick up where we left off or start over. I hate you paid all that money for your question deposit and have left not satisfied. Would any diagrams or repair guides or a phone call help?.

Thanks Chris

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